xfonts_probe Main Loop

The xfonts_probe method implements a loop.

Before implementing the loop, xfonts_probe performs the following operations:

• Retrieves the network address resources for the xfnts resource, as follows:

  /* Get the ip addresses available for this resource */
     if (scds_get_netaddr_list(scds_handle, &netaddr)) {
        scds_syslog(LOG_ERR,
            "No network address resource in resource group.");
        scds_close(&scds_handle);
        return (1);
     }
  
     /* Return an error if there are no network resources */
     if (netaddr == NULL || netaddr->num_netaddrs == 0) {
        scds_syslog(LOG_ERR,
            "No network address resource in resource group.");
        return (1);
     }

• Calls scds_fm_sleep() and passes the value of Thorough_probe_interval as the timeout value. The probe sleeps for the value of Thorough_probe_interval between probes, as follows:

  timeout = scds_get_ext_probe_timeout(scds_handle);
  
     for (;;) {
        /*
         * sleep for a duration of thorough_probe_interval between
         *  successive probes.
         */
        (void) scds_fm_sleep(scds_handle,
            scds_get_rs_thorough_probe_interval(scds_handle));

The xfnts_probe method implements the following loop:

for (ip = 0; ip < netaddr->num_netaddrs; ip++) {
         /*
          * Grab the hostname and port on which the
          * health has to be monitored.
          */
         hostname = netaddr->netaddrs[ip].hostname;
         port = netaddr->netaddrs[ip].port_proto.port;
         /*
          * HA-XFS supports only one port and
          * hence obtain the port value from the
          * first entry in the array of ports.
          */
         ht1 = gethrtime(); /* Latch probe start time */
         scds_syslog(LOG_INFO, "Probing the service on port: %d.", port);

         probe_result =
         svc_probe(scds_handle, hostname, port, timeout);

         /*
          * Update service probe history,
          * take action if necessary.
          * Latch probe end time.
          */
         ht2 = gethrtime();

         /* Convert to milliseconds */
         dt = (ulong_t)((ht2 - ht1) / 1e6);

         /*
          * Compute failure history and take
          * action if needed
          */
         (void) scds_fm_action(scds_handle,
             probe_result, (long)dt);
      }   /* Each net resource */
   }    /* Keep probing forever */

The svc_probe() function implements the probe logic. The return value from svc_probe() is passed to scds_fm_action(), which determines whether to restart the application, fail over the resource group, or do nothing.